Update .NET core version to LTS 3.1 and update Chart.js bundle

Merge pull request #4 from unity/change-date-type

Fix for date format from epoch unix s to ms

update metadata, fix show failed tests only bug

(cherry picked from commit c1dd134394ff3f950ce97ed4ccd363e584e13c54)

Merge branch 'Cleanup_refactor' into '2018.2'

Cleanup refactor

See merge request seans/PerformanceBenchmarkReporter!2

Cleanup refactor

update doc

update doc

First preview version of Unity Performance Benchmark Reporter